Abstract：
Different crustacean species can differ in their response to light. In Tanaidacea, a small group of aquatic, benthic crustaceans, previous studies suggested that several species may be positively phototactic based on their attraction to nocturnal light traps, but no experimental investigations of phototaxis had been conducted on this group. Here we show experimentally that two species in the genus Zeuxo are phototactic but exhibit opposite reactions to light; Zeuxo ezoensis, which inhabits the blades and stipes of seaweeds, was positively phototactic, whereas Zeuxo molybi, which inhabits muddy sediments overlying bedrock, was negatively phototactic. This differential response may reflect differences in photoenvironment between these species\' microhabitats.
摘要：
不同的甲壳类物种对光的反应可能不同。在Tanaidacea,一小群水生生物，底栖甲壳类动物,先前的研究表明，几种物种可能是基于它们对夜间光陷阱的吸引力，但是没有对该组进行趋光性的实验研究。在这里，我们通过实验证明Zeuxo属中的两个物种是趋光的，但对光表现出相反的反应；Zeuxoezoensis，栖息在海藻的叶片和刀柄上，是正向趋光的，而ZeuxoMolybi,栖息在基岩上的泥质沉积物中，是负的趋光性。这种差异响应可能反映了这些物种微生境之间光环境的差异。
